Git commits in Moodle 3.7.x by Arto Nieminen

commit d80d0b4142a865f40c1c3146645cb9e7c686e169
Author: Arto Nieminen <arto.nieminen@mediamaisteri.com>
Date:   Fri, 07 Jun 2019 15:27:47 +0800
Tag:    v3.7.1

MDL-53778 quiz settings: Ensure that disabled checkboxes have value 0